Logic Masters Deutschland e.V.

SudokuPad link (via tinyURL)
F-puzzles link

Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.
Arrows: digits along the arrow sum to the circled digit; Region Sum: digits along each segment of the same blue sum to the same total (line segments are divided by region borders);
Renban: digits along a pink line form an unordered consecutive set of numbers (Note: there are two two-cell renban clues in box 1).